Root/fs/jffs2/xattr.h

1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2006 NEC Corporation
5 *
6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#ifndef _JFFS2_FS_XATTR_H_
13#define _JFFS2_FS_XATTR_H_
14
15#include <linux/xattr.h>
16#include <linux/list.h>
17
18#define JFFS2_XFLAGS_HOT (0x01) /* This datum is HOT */
19#define JFFS2_XFLAGS_BIND (0x02) /* This datum is not reclaimed */
20#define JFFS2_XFLAGS_DEAD (0x40) /* This datum is already dead */
21#define JFFS2_XFLAGS_INVALID (0x80) /* This datum contains crc error */
22
23struct jffs2_xattr_datum
24{
25    void *always_null;
26    struct jffs2_raw_node_ref *node;
27    uint8_t class;
28    uint8_t flags;
29    uint16_t xprefix; /* see JFFS2_XATTR_PREFIX_* */
30
31    struct list_head xindex; /* chained from c->xattrindex[n] */
32    atomic_t refcnt; /* # of xattr_ref refers this */
33    uint32_t xid;
34    uint32_t version;
35
36    uint32_t data_crc;
37    uint32_t hashkey;
38    char *xname; /* XATTR name without prefix */
39    uint32_t name_len; /* length of xname */
40    char *xvalue; /* XATTR value */
41    uint32_t value_len; /* length of xvalue */
42};
43
44struct jffs2_inode_cache;
45struct jffs2_xattr_ref
46{
47    void *always_null;
48    struct jffs2_raw_node_ref *node;
49    uint8_t class;
50    uint8_t flags; /* Currently unused */
51    u16 unused;
52
53    uint32_t xseqno;
54    union {
55        struct jffs2_inode_cache *ic; /* reference to jffs2_inode_cache */
56        uint32_t ino; /* only used in scanning/building */
57    };
58    union {
59        struct jffs2_xattr_datum *xd; /* reference to jffs2_xattr_datum */
60        uint32_t xid; /* only used in sccanning/building */
61    };
62    struct jffs2_xattr_ref *next; /* chained from ic->xref_list */
63};
64
65#define XREF_DELETE_MARKER (0x00000001)
66static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
67{
68    return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
69}
70
71#ifdef CONFIG_JFFS2_FS_XATTR
72
73extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);
74extern void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c);
75extern void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c);
76
77extern struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
78                             uint32_t xid, uint32_t version);
79
80extern void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
81extern void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
82
83extern int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
84                         struct jffs2_raw_node_ref *raw);
85extern int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
86                       struct jffs2_raw_node_ref *raw);
87extern int jffs2_verify_xattr(struct jffs2_sb_info *c);
88extern void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd);
89extern void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref);
90
91extern int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
92                 char *buffer, size_t size);
93extern int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
94                 const char *buffer, size_t size, int flags);
95
96extern struct xattr_handler *jffs2_xattr_handlers[];
97extern struct xattr_handler jffs2_user_xattr_handler;
98extern struct xattr_handler jffs2_trusted_xattr_handler;
99
100extern ssize_t jffs2_listxattr(struct dentry *, char *, size_t);
101#define jffs2_getxattr generic_getxattr
102#define jffs2_setxattr generic_setxattr
103#define jffs2_removexattr generic_removexattr
104
105#else
106
107#define jffs2_init_xattr_subsystem(c)
108#define jffs2_build_xattr_subsystem(c)
109#define jffs2_clear_xattr_subsystem(c)
110
111#define jffs2_xattr_delete_inode(c, ic)
112#define jffs2_xattr_free_inode(c, ic)
113#define jffs2_verify_xattr(c) (1)
114
115#define jffs2_xattr_handlers NULL
116#define jffs2_listxattr NULL
117#define jffs2_getxattr NULL
118#define jffs2_setxattr NULL
119#define jffs2_removexattr NULL
120
121#endif /* CONFIG_JFFS2_FS_XATTR */
122
123#ifdef CONFIG_JFFS2_FS_SECURITY
124extern int jffs2_init_security(struct inode *inode, struct inode *dir);
125extern struct xattr_handler jffs2_security_xattr_handler;
126#else
127#define jffs2_init_security(inode,dir) (0)
128#endif /* CONFIG_JFFS2_FS_SECURITY */
129
130#endif /* _JFFS2_FS_XATTR_H_ */
131

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